5 ms·

Seriously, any time you have >3 images to stack satellites and planes are a complete non issue. The median pixel value is always going to exclude those. Five im

Seriously, any time you have >3 images to stack satellites and planes are a complete non issue. The median pixel value is always going to exclude those. Five images is enough to eliminate any trails even if they overlap between images.

nullc 3y ago
You're not imaging with cryogenic CCDs --- satellite trail can blow out whole rows.
- rblatz 3y ago
  Just do it in space and avoid the whole atmosphere and ground based light pollution. Space is cheaper than ever now, this is a problem for amateur astronomers, and hobbyists shouldn’t hold back progress.
  - nullc 3y ago
    Space imposes extraordinary costs and limitations which heavily precludes exploratory research. Instruments are built for space to achieve specific tasks which we know will be successful. Instrument development has to first occur on earth-- including the research that lets us know which things will yield results deployed in space. Astronomy aside, fleets of satellites once they turn to junk may eventually make further launching problematic.
    - djao 3y ago
      SpaceX deliberately launches satellites into orbits which are too low to sustain on their own. Once the satellites run out of propellant, which happens after a few years of normal operation, they cannot remain in orbit indefinitely and eventually burn up in the atmosphere. On very rare occasions, a launch malfunctions in such a way that the satellites end up in unintended orbits that do turn into long-term junk, but this is not the norm.
  - agos 3y ago
    "just do it in space" has got to be one of the best hacker news solution to other profession's issue I've ever read.
  - mrguyorama 3y ago
    This is equivalent to saying "Just do one percent the space science we do now" Where is SpaceX offering to put up a billion dollars worth of space observatories to offset their pollution of a public good?
- malfist 3y ago
  No, I'm not, I'm using cooled CMOS sensors. CCD is ancient tech these days.
  - nullc 2y ago
    > CCD is ancient tech these days. Their performance at cryogenic temperatures is quite good which is one reason why currently in design/construction scientific instruments are still using them. And in those instruments serious overload from shiny satellites is not just a little streak that can be easily excluded. https://www.aanda.org/articles/aa/full_html/2020/04/aa37501-20/aa37501-20.html https://www.aanda.org/articles/aa/full_html/2020/04/aa37501-...

nullc 3y ago

You're not imaging with cryogenic CCDs --- satellite trail can blow out whole rows.

rblatz 3y ago
Just do it in space and avoid the whole atmosphere and ground based light pollution. Space is cheaper than ever now, this is a problem for amateur astronomers, and hobbyists shouldn’t hold back progress.
- nullc 3y ago
  Space imposes extraordinary costs and limitations which heavily precludes exploratory research. Instruments are built for space to achieve specific tasks which we know will be successful. Instrument development has to first occur on earth-- including the research that lets us know which things will yield results deployed in space. Astronomy aside, fleets of satellites once they turn to junk may eventually make further launching problematic.
  - djao 3y ago
    SpaceX deliberately launches satellites into orbits which are too low to sustain on their own. Once the satellites run out of propellant, which happens after a few years of normal operation, they cannot remain in orbit indefinitely and eventually burn up in the atmosphere. On very rare occasions, a launch malfunctions in such a way that the satellites end up in unintended orbits that do turn into long-term junk, but this is not the norm.
- agos 3y ago
  "just do it in space" has got to be one of the best hacker news solution to other profession's issue I've ever read.
- mrguyorama 3y ago
  This is equivalent to saying "Just do one percent the space science we do now" Where is SpaceX offering to put up a billion dollars worth of space observatories to offset their pollution of a public good?
malfist 3y ago
No, I'm not, I'm using cooled CMOS sensors. CCD is ancient tech these days.
- nullc 2y ago
  > CCD is ancient tech these days. Their performance at cryogenic temperatures is quite good which is one reason why currently in design/construction scientific instruments are still using them. And in those instruments serious overload from shiny satellites is not just a little streak that can be easily excluded. https://www.aanda.org/articles/aa/full_html/2020/04/aa37501-20/aa37501-20.html https://www.aanda.org/articles/aa/full_html/2020/04/aa37501-...